Arrangement for producing short unidirected high-tension-current impulses.



A. PFEIFFER. ARRANGEMENT FOR PRODUCING sworn UNIDIRECTED mun TENSION CURRENT IMPULSES. APPLICATION FILED SEPT. 30. I9! 5.

1,199.494. I Patented Sept. 26,1916.

r A Pfeaffer.

Invenror impulses are also produced termed UNITED STATES PATENT OFFICE,

ADOLF PFEIFFE R, OF BERLIN, GERMANY, AS SIGNOR TO ELECTRICITKTSGESELISCHAFT SANITAS M. 3.11., OF BERLIN, GERMANY, A FIRM.

ARRANGEMENT iron PRODUCING SHORT nmmnnc'rnn HIGH-TENSION-CUBRENT IMPULSES.

Speciflcatiow'of Letters Patent.

Patented Sept. 26, 1916.

Application filed September 30, 1915. Serial No. 58,380.

To all whom it may concern: 7

Be it known that IFADOLF Prnrrrnn, engineer, .a subject. of the Emperor of Germany, and residing at 23 Rathenowerstrasse, Berlin, Germany, have invented certain'new and useful Improvements in Arrangements for Producing Short Unidirected High-Tension-Current Iinpulses, of which the following is a specification;

For producing short unidirected high ten- 'sioncurrent impulses, for example for work-' iii X-rayr tubes,",as a rule 'short sectigp s g f med F EQlQfiJEJlLK? terica to a ld gh t eii s ib iifare cut ii't iwit ilization fromthe n e PGQLKLQJLL AWQQQX aid or a rectifier reversing the negative waves. As this cutting out proceeds at a h igh tension, there will always be trgng occur at the de rd 7 9. Enaeaciding this bac it e roducej o tro-ma t wit s, s aves I I in the high ten was m.laslectnicicurrentw heficty iEeiilil? period 01 wiich is smal in Drop note.itesflreeeeicsnne imne einimpulse current; When the said electromagnetic machine produces an asymmetr ical impulse current that isto. say a current with one sided points, there {villbe long shallow' negat ve current waves between the said points. The negative our: Rut waves Wlll, of course, b gcp m e correspondmgiym'giiefiithe transformed liih tension current, and may, in Working X-ra tubes, lead-to the Iorming of the unwelcome closmg-hghtfg According to the present invention this drawback may be avoided bythe machine being coupled with a'switch, running synchronously therewith in the hi h te'nsi6ii"6irciiit'fili"ili"'witch fwll' break t 0 hi h tension current feeding the lg-ray tube 0 ose to the zero line after each positive ig pulse' and keep it broken for the pen of the following negative current wave, thus sion cigar. Sue

ti gaontat,einoxiofisjfii liifl wiie sj when a machine is employed, which by means of a rectifier of a known type,- di's-755 posed in the high' tension circuit, reversed, and this reversal will, here beperformed under particularly favorable condi tions, because the rectifier need not cut out curve sections from the wave maximum any more and thebreak may always occur atthe tension zero, and all sparking isavoided. In the accompanying drawing a construe tional form is exemplified in Figures 1 and 2, Fig. 1 being a full view of the arrangement, and Fig. 2 a side elevation of the switch. Fig. 3 is a diagram of an a mmet-.

rical impulse current; Fig. 4 is a iag'ram of a symmetrical impulse current; Fig. j5 is another exemplification, in which one machine feeds two circuits. 7

With the arrangement according toFig. 1 an electro-magnetic machine A is provided for producing. the impulse passing through the primary winding (1 of a transformer (t? in the said electromagnetic-machine the tips of the two poles of the armature, ap-

proach each other closely, while the, iron cores of the induced coils h, h extend onlyalong a fraction of the face of the pole shoes of the armature. As a-change in the mag: netizati'on of the iron cores of the induced coils h, h occurs only at the moment of the.

passing of the pole tips of the armature before the coils h, h, and as this change in the each revolution of the armature.

With Fig, 1 it has been assumed that the excitation of the armature s is caused by a sinoidal alternating current derived from the lines t and of a periodicity corresponding to the number of'revolutions of the machine, which alternating current is supplied by means of brushes m, to the rings 0, p

connected to the ends of the armature wind- 85 magnetization occurs very suddenly, two "short current imp ilses are thus obtained at ing under the infiuence of the sinoidal exciting current. i

In the circuit 1" of the secondary winding -b of the transformer are disposed, besides adjusted and dimensioned that the makepositions for the current coincide, as regards their timing, with the-short, high current impulses, and the breaks with the respective inegative tensions of the machine circuit, so

that the break occurs at O-tension, and the ;;'tvholc of the negative waves is cut out,

' ei ironous with the exciting alternating-curwhereby sparking is avoided. At the, rate at which, after the break,,the negative ten- *-;sion of the current rises, the switch arms f, f

. 'n' fqve farther and farther away from the contacts g, 9 until they reach the intermediate position shown by dotted lines in Fig.

-1, when the maximum of the negative tension is attained, at'which position, owing to the great distance, it is impossiblefor sparks tdjump across and for a negative current ih consequence to pass through the tube.

i he machine A may be driven in any suit- .fitldiafmanner, only the drive must be synre'i'i t. When the machine A is .driven by mechanical'means or by a direct current mo- -.tor, the synchronism is, preferably, secured disposing on the driving shaft' of the machine Aa small alternating current generator, to which theexeit'ing 'Winding of the machine A as well as the motor. 03 of the switch are connected. The .driveof the switch may, however, also be derived mechanically from the shaft of the machine A, either by direct couplin or by means of a gearing. When the mac ine A is excited by direct current, a symmetrical impulse cur rent according to Fig; 4 is obtained, that is to say, -'a current with alternately positive and negative points and lengthy intervals therebetween. The current in t high ten sion circuit 11 proceeds accordi' In this case a rectifier k of a known type is substituted for the switch, as indicated diagrammatically inFig. 5, which rectifier may be synchronouslydriven by means of a motor (l connected to' an alternating current generator u arranged on the shaft of machine A. The combination of a rectifier with the mathe one hand, the rectifierno more serves to cut out section; of the curve at the wave maxima, but only for reversing the negative current waves, and that owing to the wide limits available, the reversing will always occur at a tension zero without any need of an accurate regulation.

The machine A shown in Fig. 5 has two pairs of induced coils It, It and i, 2', respectively, of which pairs of coils each feeds a separate transformer ab and a-)' respectively. In each of the circuits ed by the high tension windings of the transformers is disposed an X-ray tube 0 and 0', re-. spectively, and a rectifier k and la, respectively, the rectifier is being also driven by a motor d, connected to thegenerator u. The rectifiers are here also necessary in' the case, that the machine is excited by alternat- .ing current, because an alternating current .of double the number of cycles must beused for the excitation. Insteadof two pairs of coils, of course, alsoa larger number may be employed, in order to feed a correspondingly larger number of circuits.

I claim:

- t fr roducin shot uni-' ion current im' ulses i a che waveswHS' ble p0, i e riodic time, a high tension transformer WIEE;

a primary winding fed by said machine and a scdar a evice or uti izin 75m un'o 4.

rpdciiig short uni.-

' directed high tension current impulses, coin-Q prising a machine generating waves .yvhose serviceable portion is a fraction of-tli'e pea primary windingfed by said'niachine and. a secondary Winding .co 'inected to a circuit includinga 'dev-icegfo'r utilizing the high 1 tension current impulses jproduced-jin the secondary winding and a power driven 10 5 switch connected toa mo tor-synchrenized- V with a primary winding connected to a cir- 1'15 cuit" including a device for iutili z'ing'the high tension current impulses produced in the secondary winding and'aj switch being a p in operative connection with a motor con f nected to the excitingcircuit of'the ma- 120 -chine. I chine shownaffords the advantage that, on

utilizing the high tension-current impulses 1 riodicti'me, a high tension transformer :with

produced in the secondary winding and a power driien rectifier, and means to drive said rectifier synchronously with said machine.

5. Arrangement for producing short unidirected high tension current impulses comprising a machine generating symmetrical waves whose serviceable portion is a. fraction of the periodic time, a high tension transformer with a primary winding fed by said machine and a secondary winding connected to a circuit including a device for utilizing the high tension current impulses produced in the secondary winding and a rectifier being in operative connection with it motor synchronized with said machine.

6. Arrangement for producing short unidireeted high tension current impulses, comprising an impulse currentmarhmo wil several out-of-phasc induced windings, several high tension transformers with their pr mary windings fed by the several windlngs of the machine and theirsccondary windings connected to circuits including devices for utilizing the high tension current impulses produced in the secondary wind' ings, a rectifier in each of said circuits, and means to drive said rectifiers synchronously with said machine.

In witness whereof I have hereunto set my hand in the presence of,two witnesses.

ADOLF PFEIFFER.

Witnesses Anons'r TRAUTMANN, HENRY HASPER. 

